3) Liseberg, Projekt Helix coaster

Liseberg

Based on Mack Rides' Blue Fire megacoaster, the $30-million Projekt Helix set to debut in spring 2014 at Sweden's Liseberg amusement park will feature plenty of steep drops, banked turns and airtime hills as well as six inversions, including a pretzel loop, a heart-line roll and a pair of corkscrews.

Based on Mack Rides' Blue Fire megacoaster, the $30-million Projekt Helix set to debut in spring 2014 at Sweden's Liseberg amusement park will feature plenty of steep drops, banked turns and airtime hills as well as six inversions, including a pretzel loop, a heart-line roll and a pair of corkscrews. (Liseberg)

Based on Mack Rides' Blue Fire megacoaster, the $30-million Projekt Helix set to debut in spring 2014 at Sweden's Liseberg amusement park will feature plenty of steep drops, banked turns and airtime hills as well as six inversions, including a pretzel loop, a heart-line roll and a pair of corkscrews.